Mouthpiece.



L. STEINBERGER.

MOUTHPIECE.

APPLlCATlON FILED FEB.10. 1912.

Patented Nov. 16, 1S)

INVENTOB AITORNEYS WITNESSES Application filed Es-wary 10, 1912 fa-m may concern: mere 01* bra-u 1 I 1 Lnmvn that 1 Lows STEmBERGER, rewiil :19 32a simng Brosklyn, in the county of Kings #11 and. Susie 0f New Ymk, have invented. csrlb /ring duscripz, mm new and useful Improvements in natiens Mauihpieces. of which the following is & natiims specification.

This invention relates to sound transmit- LiPg devices, as sxempiified in the Emits mitts? 0t teiephone set, for instsn L ner devices 11?. which we 3101;. may be embodiedL A the abjecis of my inveniion are: To improve the acoustical pmpezr'ties of sound transmitting devices a? {the gens-23 character referred to. 11. T9 pmvide ie iephone transmitter, 01' other sound trans mijizing (xvii- 5 0? such constrnvtion that the iikelihaod sf whipping m: breaking away of exposmi p 011s of the m'tinlu minimize HI. To gin: 10 certain uxposed portions 0f 21 devi s) o? the. kind wf z'rml in sm-h fm'm the complete structure W533 have no pm'tiozi :Ii'en lug nut fmm Sm gcnvmi 0:159" surnwa ni' the device. am. xvii! minimum of abrupt corners. vspw tans parts which ordinarily fan-a :senstrue s 2:; :110 n J *ecescimg emtm'; hinva it xviil be flee mm: 3 L- g 31s numerals places for disease germs, and; may readily be emiiv sin cleansed when necessary or dosimlfic. Qv'l $106k, T0 provide a devise of the kind referra n vpsning in. which cermzn readily mmovabhx pnrxu are such. (ronfm'zniflv {Mt glass. p01

or the E. M; main-i211 may m: vmpiuyvfi Wiih good effecs; when suvh materials are em; 103x053 the dcvivc bvcomesi'lygicnic in she sense 6f the word Sim": the rnnxovaific portions may be boiled in watm' or 0 101* liquid, -01 CEGVIESEG in disinfecting salutinns or the like. a To provide, more specifically, a mmztlmiecs fur telephonv transmitters, '1 10, and vmmumival t0 nanufz. film-r from a 3" appropriate 'xz .fllfii'ifli, w'z

desirably sanitary 1nd vmy ('hn'abie, 2mm Whiuh 'is, vithai, grm-einl in appearance VI. To providu. in a tulcphcne transmit er, 1L unitary member in tho farm of a said block, whir'h serves both as n cap-plate and momhpieve, and \vixivh may entirely cover men'aimz 4 30: 21):; 110 diaphragm and clamps the latter in poploim'fibiy spiwrimi sition. 1 H To provide. in a telephone xv-.431 respectts the ca h-zmsnlitim' a imp-plate which 011L111 y mwthat tho. 1011 1 1's file diaphragm and forms tlmz'mvith :1 swim-Side If n distributing chamber whose gz'cutust width iiwrmf t. s is at Hm comer, gradually constxgtcd mm ahead} wax-(Hy. 0mm Siiifilu'li,

Other objects and aims of the invention, Such a memi.

intended to be supported by a transmitter casing r the like, into which sound waves are transmitted through the opening 5. In

Fig. 2 1 show the member 4 applied as the cap and mouthpiece of a. transmitter casing 9. -Here the end of the casing provides an annular seat 10, and a diaphragm 11 extends across the casing, resting upon the seat 10, and the diaphragm is clamped-in position between the seat 10 and the offset member 7, when the block 4 is laid over the end of the casing as shown.

As an example of means for holding the block and casing in assembled relation, I may provide a ring member 12 of such diameter that it may be dropped over the block and seat upon the ledge 7, and having :1 depending interiorly threaded annular flange 14 which is adapted to engage the correspondingly threaded circumference of the casing at the end thereof. Obviously, I might secure the parts together in other ways, and the method and means described are merely illustrative. T he transmitter caS- ing will of course contain the necessary devices (not shown) for utilizing "thevibrations whichmay be set upin the diaphragm.

By reason of the sloping surfaces of the inner face of member 4-, which are opposed to the plane surface of the diaphragm, there is formed a circular chamber between the diaphragm and the member 4, which chamber is of greatest width at its center and gradually constricted. outwardly from the center. By this arrangement and its combination with the form of the opening 5, as

well as by the general construction, the acoustical properties of the device are much improved over what they would be if the inner surface of the member 4 were made parallel. with the outer surface of the diaphragm.

It will be evident that such a device as I have described will attain, among others, the objects set out above. The member s is simple and. econon'iical to manufacture, and may easily be made of any appropriate material. The device may readily be so cured to a supporting 'or body member in a simple way, and at small expense; when it is in place on its support tbcrc is no extreme projection of any part, so that'liability of breakage is practically obviated, besides which the mcmbcr -l-, being substantially a thick, solid block, is inherently more durable than the relatively thin, frail, mouthpicces now gener lly used. Where the device cmbodiml' in a transmitter, it pri'ividesin a single piece a cover plate, and a mouthpiece covering the entire surface of the diaphragm, and olampin the diaphragm'in position. livrcason or the peculiar form of the inner face of the memher 4, and also vthat of the entire device, the acoustical properties of an instrument with which it isincluded are greatly improved. And finally, the device is most sanitary, since it afl'ords few lodging places for 'germs, and is, owing to its outward form and its ready detachability, readily cleansed, in situ 'or when removed.

Where the device is not made up of porcelain or the like, it may be of the material well known in the art as Electrose, or of some other suitable, preferably insulating, material. is no threaded connection between the easing and block, is particularly well adapted for porcelain or glass embodiments, which are threaded but with difficulty, and when threaded are "ery liable to be broken when the screw connection is made.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying, drawings shall be interpreted as illustrative and not in a limiting sense. It is also to'be understood that the language used in the following'claim is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention, which as a matter of language, might be said to fall thcrebet-wcen. i

Having thus described my invention, what I claim as new and desire to secure by Lettcrs- Patent is:

A mouthpiece for a telephone transmitter casing comprising, an annular disk like member of a diameter substantially the same as theexterioudiameter ot' the transmitter casing, and being arranged over the end of the casing, said member being concuved on its inncrz-surface and convexed centrally tberc- The formshown, in which there 

